![MindTap for Herman's Understanding Motor Controls, 4th Edition [Instant Access], 2 terms](https://s3.amazonaws.com/compass-isbn-assets/textbook_empty_images/large_textbook_empty.svg)
MindTap for Herman's Understanding Motor Controls, 4th Edition [Instant Access], 2 terms
4th Edition
ISBN: 9781337798754
Author: Herman; Stephen L.
Publisher: Cengage Learning US
expand_more
expand_more
format_list_bulleted
Concept explainers
Question
Chapter 33, Problem 1RQ
To determine
Identify the two factors that determine the synchronous speed.
Expert Solution & Answer
Explanation of Solution
Synchronous speed:
The speed at which the magnetic field rotates in a motor is called the synchronous speed. The synchronous speed is given by the formula:
Here, the synchronous speed in RPM is s, the frequency in Hz is f, and the number of stator poles per phase is P.
The two factors that determine the synchronous speed of the motor are given below:
- The number of stator poles per phase.
- The frequency of the applied voltage.
Want to see more full solutions like this?
Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!
Students have asked these similar questions
A commercial office building is located in the city of Lansing, Michigan, and is heatedusing a gaseous fuel with a heating value of 725 Btu/std ft3. The indoor designtemperature is 71ºF. The heat load for the building is known to be 250,000 Btu/hr. Thisheat load accounts for the fact that there are internal heat gains in the building, due tothe presence of people and electronic equipment (e.g., lights and radios). People in thebuilding are usually seated and involved in light activity.a) The furnace had an initial efficiency factor of 73% when installed, but since thenefficiency-improvement retrofits were implemented that raised the efficiency factorto its present value of 82%. The building was designed using the 99% designheating temperature value for the city to determine the outdoor design temperature.Evaluate the annual fuel quantity (in std ft3) required to heat the building, using thedegree-day or bin method.b) Seventy people use the building, but the occupancy pattern for the…
The volumetric flow rate of air through a duct transition of the type shown in Table 12-9b (rectangular with two parallel sides) is 2 m3/s. The duct before the transition issquare, with a height of 50 cm. The expansion ratio across the transition is 4 (i.e., theduct area after the transition is 4 times greater than the duct area before the transition).a) Determine the pressure loss (in Pa) across the transition if the exit from the duct isabrupt (i.e., the diverging angle of the transition is 180º).b) Determine the percentage reduction in pressure loss for a transition diverging angleof 20º compared to the one in part (a).c) The head HVAC engineer requires the pressure loss across the transition to bereduced to less than 50% of the pressure loss for an abrupt exit (i.e., the case in part(a)), and suggests a transition diverging angle of 45º. Will this new diverging angleachieve the required reduction in pressure loss? Justify your answer.d) For a transition diverging angle of 90º, the…
The volumetric flow rate of air through a duct transition of the type shown in Table 12-9b (rectangular with two parallel sides) is 2 m3/s. The duct before the transition issquare, with a height of 50 cm. The expansion ratio across the transition is 4 (i.e., theduct area after the transition is 4 times greater than the duct area before the transition).a) Determine the pressure loss (in Pa) across the transition if the exit from the duct isabrupt (i.e., the diverging angle of the transition is 180º).b) Determine the percentage reduction in pressure loss for a transition diverging angleof 20º compared to the one in part (a).c) The head HVAC engineer requires the pressure loss across the transition to bereduced to less than 50% of the pressure loss for an abrupt exit (i.e., the case in part(a)), and suggests a transition diverging angle of 45º. Will this new diverging angleachieve the required reduction in pressure loss? Justify your answer.d) For a transition diverging angle of 90º, the…
Chapter 33 Solutions
MindTap for Herman's Understanding Motor Controls, 4th Edition [Instant Access], 2 terms
Ch. 33 - Prob. 1RQCh. 33 - Prob. 2RQCh. 33 - What is the advantage of consequent pole motors...Ch. 33 - Prob. 4RQCh. 33 - Refer to the circuit shown in Figure 33–6. You are...Ch. 33 - Refer to the circuit shown in Figure 336. What is...Ch. 33 - Refer to the circuit shown in Figure 33–7. When...Ch. 33 - Prob. 8RQCh. 33 - Refer to the circuit shown in Figure 33–11....Ch. 33 - Refer to the circuit shown in Figure 3311. You are...
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- Auto Controls The figure is a schematic diagram of an aircraft elevator control system. The input to the systemin the deflection angle of the control lever , and the output is the elevator angle phi.show that for each angle theta of the control lever ,there is a corresponding elevator angle phi. Then find Y(s)/theta(s) and simplify the resulting transfer function . Also note from the diagram that y and phi is related Show full solution, no copied solutionsarrow_forwardhand-written solutions only. correct answers upvotedarrow_forwardFor a small house located in Ottawa, Ontario, there are three windows and three doors.You are assigned the task of determining the infiltration and related heat loss rates.It has been found experimentally that the pressure difference due to pressurization is -0.002 in. water. The pressure difference due to stack effect for this building is assumednegligible due to it having only a single floor. The dominant mean wind speed fordesign is assumed to be 15 mph. The house orientation is such that it is normal to thedominant mean wind direction.The house was built recently and all of the windows and doors are tight fitting. Thehouse construction and materials are typical for Ottawa, Ontario. The doors are 3 ftwide and 6.75 ft high. Each of the windows is double hung and each window has thefollowing overall dimensions: 3 ft wide and 4 ft high. (For clarity it is noted that eachdouble hung window has two glass segments that are 3 ft wide and 2 ft high.)The indoor design temperature is 70ºF and…arrow_forward
- H.W1: Due to the applied loading, the element at point A on the solid cylinder is subjected to the state of stress shown. Determine the principal 6 ksi stresses acting at this point. 12 ksiarrow_forwardA wall is 7 m wide and 3 m high, and contains two doors and one window. Details onthe wall components are as follows:• The window is a triple-glazed glass window with a 6.4 mm space filled withargon gas. The window surfaces do not have any special surface emissivitycoatings. The window dimensions are 2 m by 1 m, and the window has analuminum sash with a thermal break.• The wall material has an overall heat-transfer coefficient of 0.5 W/(m2-ºC).• Each door is a solid core flush door made of wood, with a thickness of 4.5 cm.Also, each door is 2.1 m high and 0.8 m wide. Both doors are accompanied bymetal storm doors.a) Determine the overall heat-transfer coefficient [in W/(m2-ºC)] for the wallcombination (based on the overall dimensions of the wall-window-doorscombination), assuming winter conditions.b) The room is maintained at a temperature of 22ºC. If the heat flow rate through thewall is 0.4 kW at a certain time, what is the outdoor temperature at that time?Infiltration can be…arrow_forwardhand-written solutions only. correct answers upvotearrow_forward
- Can you use MATLAB?arrow_forwardhand-written solutions only! correct answers upvotedarrow_forwardSuppose that in a system with generalized coordinates 0₁ and 02, the equations of motion are found to be as follows. ƒ (×1,$1‚Ï‚½‚†2,$2,01,01,02, 02, 02, 02) = Q1 + C₁ (1,1,1,1,1,1,0₁,01,02,02,02,02) = C₂ In this system, a nonholonomic constraint for 12 = 0 was introduced to solve for a constraint force. r₁ is a constant. Which of the terms in these equations should go to zero, and why?arrow_forward
- 3.) 13.152* - A sphere (m = 2 kg) is connected to a fixed point O by an inextensible cord (L = 1.2 m). The sphere rests on a frictionless horizontal surface at a distance of x = 0.5 m from O when it is given a velocity (V.) in a direction perpendicular to OA. It moves freely until it reach A', when the cord becomes taut. Find the maximum possible velocity v. if the impulse of the force exerted on the cord is not to exceed F = 3Ns.arrow_forward4.) 13.165* - Two billiard balls A & B (same mass m & diameter d = 2.37") are as shown. Ball A has velocity V₁ = 3 ft/s when it strikes B, which is at rest. B then moves in the x direction after impact. Find (a) angle 0, (b) the velocity of B after impact (VB'). Positional variables are x = 6" and y = 10", and e = 0.9.arrow_forwardWe will consider a linear system and a nonlinear system under uncertainty, each expressed in the form of a set of stochastic differential equation (SDE) as follows: = da (Ax+ Bu)dt + Gdw, dx = f(x,u,t)dt+Gdw, (1) (2) where x is the state, u is the control, and dw is a differential increment of standard Brownian motion, i.e., E[dw] = 0 and E [dw(t)dw(t)] = dt-1. In this problem, we consider the linear SDE, Eq. (1), with a very simple model where x = R², u = [0,0] (no control), and dw R². The matrices A, B, and G are given as follows: A=02x2, B=02x2; G = [000] (3) where σp Є R represents the degree of the uncertainty, and let us take σ₁ = 2 and σ2 = 3. Assume that the initial state is deterministic and e(t = 0) = [0,0]. Take the following steps to simulate the given SDE for 1 € [0, 1]: (a): Consider the increments of w between each time interval [+1). Derive the analytical expression of Aw using w~N(02, 12), where Aw, w(tk+1) — w(tk). (c): Derive the approximate continuous-time EoM from…arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Understanding Motor ControlsMechanical EngineeringISBN:9781337798686Author:Stephen L. HermanPublisher:Delmar Cengage Learning
Electrical Transformers and Rotating MachinesMechanical EngineeringISBN:9781305494817Author:Stephen L. HermanPublisher:Cengage Learning
Refrigeration and Air Conditioning Technology (Mi...Mechanical EngineeringISBN:9781305578296Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill JohnsonPublisher:Cengage Learning
Understanding Motor Controls
Mechanical Engineering
ISBN:9781337798686
Author:Stephen L. Herman
Publisher:Delmar Cengage Learning
Electrical Transformers and Rotating Machines
Mechanical Engineering
ISBN:9781305494817
Author:Stephen L. Herman
Publisher:Cengage Learning
Refrigeration and Air Conditioning Technology (Mi...
Mechanical Engineering
ISBN:9781305578296
Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher:Cengage Learning